According to CBS Detroit, the assistant manager at the BP gas station said the argument was apparently over the price of a box of condoms.

He said the customer bought a box of condoms, but complained that he was overcharged and could have bought them somewhere else for a cheaper price.

After being told he couldn’t get a refund, the customer allegedly began tossing items off the shelves and that’s when, according to the employee, the overnight clerk came out with a gun and fired a warning shot, which struck the customer in the shoulder.

Police say the customer was taken to a local hospital where he later died from his injuries. Police say the store clerk, whose name has not been released, is in custody and an investigation is ongoing.